Tokyo Power and Electric (Tepco) is running into technical problems with the massive ice wall it is trying to build to contain radioactive water from the stricken Fukushima nuclear station. “We have yet to form the ice stopper because we can’t make the temperature low enough to freeze water,” according to a Tepco representative cited by AFP. “We are behind schedule but have already taken additional measures, including putting in more pipes, so that we can remove contaminated water from the trench starting next month.”